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Diffstat (limited to 'modules/pam_unix/pam_unix.8')
| -rw-r--r-- | modules/pam_unix/pam_unix.8 | 301 |
1 files changed, 246 insertions, 55 deletions
diff --git a/modules/pam_unix/pam_unix.8 b/modules/pam_unix/pam_unix.8 index 2f0d0008..6970b9f3 100644 --- a/modules/pam_unix/pam_unix.8 +++ b/modules/pam_unix/pam_unix.8 @@ -1,85 +1,243 @@ .\" Title: pam_unix -.\" Author: -.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> -.\" Date: 04/16/2008 +.\" Author: [see the "AUTHOR" section] +.\" Generator: DocBook XSL Stylesheets v1.74.0 <http://docbook.sf.net/> +.\" Date: 06/16/2009 .\" Manual: Linux-PAM Manual .\" Source: Linux-PAM Manual +.\" Language: English .\" -.TH "PAM_UNIX" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.TH "PAM_UNIX" "8" "06/16/2009" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" ----------------------------------------------------------------- +.\" * (re)Define some macros +.\" ----------------------------------------------------------------- +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" toupper - uppercase a string (locale-aware) +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.de toupper +.tr aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYzZ +\\$* +.tr aabbccddeeffgghhiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz +.. +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" SH-xref - format a cross-reference to an SH section +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.de SH-xref +.ie n \{\ +.\} +.toupper \\$* +.el \{\ +\\$* +.\} +.. +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" SH - level-one heading that works better for non-TTY output +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.de1 SH +.\" put an extra blank line of space above the head in non-TTY output +.if t \{\ +.sp 1 +.\} +.sp \\n[PD]u +.nr an-level 1 +.set-an-margin +.nr an-prevailing-indent \\n[IN] +.fi +.in \\n[an-margin]u +.ti 0 +.HTML-TAG ".NH \\n[an-level]" +.it 1 an-trap +.nr an-no-space-flag 1 +.nr an-break-flag 1 +\." make the size of the head bigger +.ps +3 +.ft B +.ne (2v + 1u) +.ie n \{\ +.\" if n (TTY output), use uppercase +.toupper \\$* +.\} +.el \{\ +.nr an-break-flag 0 +.\" if not n (not TTY), use normal case (not uppercase) +\\$1 +.in \\n[an-margin]u +.ti 0 +.\" if not n (not TTY), put a border/line under subheading +.sp -.6 +\l'\n(.lu' +.\} +.. +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" SS - level-two heading that works better for non-TTY output +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.de1 SS +.sp \\n[PD]u +.nr an-level 1 +.set-an-margin +.nr an-prevailing-indent \\n[IN] +.fi +.in \\n[IN]u +.ti \\n[SN]u +.it 1 an-trap +.nr an-no-space-flag 1 +.nr an-break-flag 1 +.ps \\n[PS-SS]u +\." make the size of the head bigger +.ps +2 +.ft B +.ne (2v + 1u) +.if \\n[.$] \&\\$* +.. +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" BB/BE - put background/screen (filled box) around block of text +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.de BB +.if t \{\ +.sp -.5 +.br +.in +2n +.ll -2n +.gcolor red +.di BX +.\} +.. +.de EB +.if t \{\ +.if "\\$2"adjust-for-leading-newline" \{\ +.sp -1 +.\} +.br +.di +.in +.ll +.gcolor +.nr BW \\n(.lu-\\n(.i +.nr BH \\n(dn+.5v +.ne \\n(BHu+.5v +.ie "\\$2"adjust-for-leading-newline" \{\ +\M[\\$1]\h'1n'\v'+.5v'\D'P \\n(BWu 0 0 \\n(BHu -\\n(BWu 0 0 -\\n(BHu'\M[] +.\} +.el \{\ +\M[\\$1]\h'1n'\v'-.5v'\D'P \\n(BWu 0 0 \\n(BHu -\\n(BWu 0 0 -\\n(BHu'\M[] +.\} +.in 0 +.sp -.5v +.nf +.BX +.in +.sp .5v +.fi +.\} +.. +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" BM/EM - put colored marker in margin next to block of text +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.de BM +.if t \{\ +.br +.ll -2n +.gcolor red +.di BX +.\} +.. +.de EM +.if t \{\ +.br +.di +.ll +.gcolor +.nr BH \\n(dn +.ne \\n(BHu +\M[\\$1]\D'P -.75n 0 0 \\n(BHu -(\\n[.i]u - \\n(INu - .75n) 0 0 -\\n(BHu'\M[] +.in 0 +.nf +.BX +.in +.fi +.\} +.. +.\" ----------------------------------------------------------------- +.\" * set default formatting +.\" ----------------------------------------------------------------- .\" disable hyphenation .nh .\" disable justification (adjust text to left margin only) .ad l -.SH "NAME" -pam_unix - Module for traditional password authentication -.SH "SYNOPSIS" -.HP 12 -\fBpam_unix\.so\fR [\.\.\.] +.\" ----------------------------------------------------------------- +.\" * MAIN CONTENT STARTS HERE * +.\" ----------------------------------------------------------------- +.SH "Name" +pam_unix \- Module for traditional password authentication +.SH "Synopsis" +.fam C +.HP \w'\fBpam_unix\&.so\fR\ 'u +\fBpam_unix\&.so\fR [\&.\&.\&.] +.fam .SH "DESCRIPTION" .PP -This is the standard Unix authentication module\. It uses standard calls from the system\'s libraries to retrieve and set account information as well as authentication\. Usually this is obtained from the /etc/passwd and the /etc/shadow file as well if shadow is enabled\. +This is the standard Unix authentication module\&. It uses standard calls from the system\'s libraries to retrieve and set account information as well as authentication\&. Usually this is obtained from the /etc/passwd and the /etc/shadow file as well if shadow is enabled\&. .PP The account component performs the task of establishing the status of the user\'s account and password based on the following \fIshadow\fR -elements: expire, last_change, max_change, min_change, warn_change\. In the case of the latter, it may offer advice to the user on changing their password or, through the +elements: expire, last_change, max_change, min_change, warn_change\&. In the case of the latter, it may offer advice to the user on changing their password or, through the \fBPAM_AUTHTOKEN_REQD\fR -return, delay giving service to the user until they have established a new password\. The entries listed above are documented in the +return, delay giving service to the user until they have established a new password\&. The entries listed above are documented in the \fBshadow\fR(5) -manual page\. Should the user\'s record not contain one or more of these entries, the corresponding +manual page\&. Should the user\'s record not contain one or more of these entries, the corresponding \fIshadow\fR -check is not performed\. +check is not performed\&. .PP -The authentication component performs the task of checking the users credentials (password)\. The default action of this module is to not permit the user access to a service if their official password is blank\. +The authentication component performs the task of checking the users credentials (password)\&. The default action of this module is to not permit the user access to a service if their official password is blank\&. .PP A helper binary, -\fBunix_chkpwd\fR(8), is provided to check the user\'s password when it is stored in a read protected database\. This binary is very simple and will only check the password of the user invoking it\. It is called transparently on behalf of the user by the authenticating component of this module\. In this way it is possible for applications like +\fBunix_chkpwd\fR(8), is provided to check the user\'s password when it is stored in a read protected database\&. This binary is very simple and will only check the password of the user invoking it\&. It is called transparently on behalf of the user by the authenticating component of this module\&. In this way it is possible for applications like \fBxlock\fR(1) -to work without being setuid\-root\. The module, by default, will temporarily turn off SIGCHLD handling for the duration of execution of the helper binary\. This is generally the right thing to do, as many applications are not prepared to handle this signal from a child they didn\'t know was -\fBfork()\fRd\. The +to work without being setuid\-root\&. The module, by default, will temporarily turn off SIGCHLD handling for the duration of execution of the helper binary\&. This is generally the right thing to do, as many applications are not prepared to handle this signal from a child they didn\'t know was +\fBfork()\fRd\&. The \fBnoreap\fR -module argument can be used to suppress this temporary shielding and may be needed for use with certain applications\. +module argument can be used to suppress this temporary shielding and may be needed for use with certain applications\&. .PP -The password component of this module performs the task of updating the user\'s password\. +The password component of this module performs the task of updating the user\'s password\&. .PP -The session component of this module logs when a user logins or leave the system\. +The session component of this module logs when a user logins or leave the system\&. .PP -Remaining arguments, supported by others functions of this module, are silently ignored\. Other arguments are logged as errors through -\fBsyslog\fR(3)\. +Remaining arguments, supported by others functions of this module, are silently ignored\&. Other arguments are logged as errors through +\fBsyslog\fR(3)\&. .SH "OPTIONS" .PP \fBdebug\fR .RS 4 Turns on debugging via -\fBsyslog\fR(3)\. +\fBsyslog\fR(3)\&. .RE .PP \fBaudit\fR .RS 4 -A little more extreme than debug\. +A little more extreme than debug\&. .RE .PP \fBnullok\fR .RS 4 -The default action of this module is to not permit the user access to a service if their official password is blank\. The +The default action of this module is to not permit the user access to a service if their official password is blank\&. The \fBnullok\fR -argument overrides this default\. +argument overrides this default\&. .RE .PP \fBtry_first_pass\fR .RS 4 -Before prompting the user for their password, the module first tries the previous stacked module\'s password in case that satisfies this module as well\. +Before prompting the user for their password, the module first tries the previous stacked module\'s password in case that satisfies this module as well\&. .RE .PP \fBuse_first_pass\fR .RS 4 The argument \fBuse_first_pass\fR -forces the module to use a previous stacked modules password and will never prompt the user \- if no password is available or the password is not appropriate, the user will be denied access\. +forces the module to use a previous stacked modules password and will never prompt the user \- if no password is available or the password is not appropriate, the user will be denied access\&. .RE .PP \fBnodelay\fR .RS 4 -This argument can be used to discourage the authentication component from requesting a delay should the authentication as a whole fail\. The default action is for the module to request a delay\-on\-failure of the order of two second\. +This argument can be used to discourage the authentication component from requesting a delay should the authentication as a whole fail\&. The default action is for the module to request a delay\-on\-failure of the order of two second\&. .RE .PP \fBuse_authtok\fR @@ -88,17 +246,17 @@ When password changing enforce the module to set the new password to the one pro \fBpassword\fR module (this is used in the example of the stacking of the \fBpam_cracklib\fR -module documented above)\. +module documented below)\&. .RE .PP \fBnot_set_pass\fR .RS 4 -This argument is used to inform the module that it is not to pay attention to/make available the old or new passwords from/to other (stacked) password modules\. +This argument is used to inform the module that it is not to pay attention to/make available the old or new passwords from/to other (stacked) password modules\&. .RE .PP \fBnis\fR .RS 4 -NIS RPC is used for setting new passwords\. +NIS RPC is used for setting new passwords\&. .RE .PP \fBremember=\fR\fB\fIn\fR\fR @@ -106,84 +264,117 @@ NIS RPC is used for setting new passwords\. The last \fIn\fR passwords for each user are saved in -\fI/etc/security/opasswd\fR -in order to force password change history and keep the user from alternating between the same password too frequently\. +\FC/etc/security/opasswd\F[] +in order to force password change history and keep the user from alternating between the same password too frequently\&. .RE .PP \fBshadow\fR .RS 4 -Try to maintain a shadow based system\. +Try to maintain a shadow based system\&. .RE .PP \fBmd5\fR .RS 4 -When a user changes their password next, encrypt it with the MD5 algorithm\. +When a user changes their password next, encrypt it with the MD5 algorithm\&. .RE .PP \fBbigcrypt\fR .RS 4 -When a user changes their password next, encrypt it with the DEC C2 algorithm\. +When a user changes their password next, encrypt it with the DEC C2 algorithm\&. .RE .PP \fBsha256\fR .RS 4 -When a user changes their password next, encrypt it with the SHA256 algorithm\. If the SHA256 algorithm is not known to the libcrypt, fall back to MD5\. +When a user changes their password next, encrypt it with the SHA256 algorithm\&. If the SHA256 algorithm is not known to the +\fBcrypt\fR(3) +function, fall back to MD5\&. .RE .PP \fBsha512\fR .RS 4 -When a user changes their password next, encrypt it with the SHA512 algorithm\. If the SHA512 algorithm is not known to the libcrypt, fall back to MD5\. +When a user changes their password next, encrypt it with the SHA512 algorithm\&. If the SHA512 algorithm is not known to the +\fBcrypt\fR(3) +function, fall back to MD5\&. +.RE +.PP +\fBblowfish\fR +.RS 4 +When a user changes their password next, encrypt it with the blowfish algorithm\&. If the SHA512 algorithm is not known to the +\fBcrypt\fR(3) +function, fall back to MD5\&. .RE .PP \fBrounds=\fR\fB\fIn\fR\fR .RS 4 -Set the optional number of rounds of the SHA256 and SHA512 password hashing algorithms to -\fIn\fR\. +Set the optional number of rounds of the SHA256, SHA512 and blowfish password hashing algorithms to +\fIn\fR\&. .RE .PP \fBbroken_shadow\fR .RS 4 -Ignore errors reading shadow inforation for users in the account management module\. +Ignore errors reading shadow information for users in the account management module\&. .RE .PP Invalid arguments are logged with -\fBsyslog\fR(3)\. -.SH "MODULE SERVICES PROVIDED" +\fBsyslog\fR(3)\&. +.SH "MODULE TYPES PROVIDED" .PP -All service are supported\. +All module types (\fBaccount\fR, +\fBauth\fR, +\fBpassword\fR +and +\fBsession\fR) are provided\&. .SH "RETURN VALUES" .PP PAM_IGNORE .RS 4 -Ignore this module\. +Ignore this module\&. .RE .SH "EXAMPLES" .PP An example usage for -\fI/etc/pam\.d/login\fR +\FC/etc/pam\&.d/login\F[] would be: .sp +.if n \{\ .RS 4 +.\} +.fam C +.ps -1 .nf +.if t \{\ +.sp -1 +.\} +.BB lightgray adjust-for-leading-newline +.sp -1 + # Authenticate the user -auth required pam_unix\.so +auth required pam_unix\&.so # Ensure users account and password are still active -account required pam_unix\.so +account required pam_unix\&.so # Change the users password, but at first check the strength # with pam_cracklib(8) -password required pam_cracklib\.so retry=3 minlen=6 difok=3 -password required pam_unix\.so use_authtok nullok md5 -session required pam_unix\.so +password required pam_cracklib\&.so retry=3 minlen=6 difok=3 +password required pam_unix\&.so use_authtok nullok md5 +session required pam_unix\&.so +.EB lightgray adjust-for-leading-newline +.if t \{\ +.sp 1 +.\} .fi +.fam +.ps +1 +.if n \{\ .RE +.\} .sp .SH "SEE ALSO" .PP \fBpam.conf\fR(5), -\fBpam.d\fR(8), +\fBpam.d\fR(5), \fBpam\fR(8) .SH "AUTHOR" .PP -pam_unix was written by various people\. +pam_unix was written by various people\&. |